Before folding into centre-Left political parties, the Millennial Left went through a ‘neo-anarchist’ or ‘prefigurative’ phase. The ‘movement of the squares’ (encompassing Occupy and the Indignados) is the most visible manifestation of this prefigurative turn in politics. With prefiguration on the rise again today, this teach-in seeks to clarify and critique this tendency as a historical phenomenon of the Left.